I remember when GrandCentral had some kind of an enterprise web service stack! I still have their CD somewhere from 2001 conference I attended. No wonder that idea went nowhere... you couldn't even describe it in 2 sentences. From what I remember, they went through a mountain of cash.

http://searchwebservices.techtarget.com/originalContent/0,289142,sid26_gci844506,00.html

I'll probably never use their new service.. I've got enough bills relating to phones/internet/cell-data services.